System of electric-current distribution



' C. A. TURNER. SYSTEM OF ELECTRIC CURRENT DISTRI B UTJON.

APPLICATION FILED FEB. 16. \92 o.

1,402,386. Patented Jan. 3, 1922.

Fig. 2

3 N CHHRLES F! TURNER \/\/V\/ INVENTOR.

- ATTORNEYS. Il

CEARLES A. .TURNER, OF CHICAGO, ILLINOIS, ASSIGNOR 0F ONE-HALF T0 FRED G.

WALDENFELS, OF CHICAGO, ILLINOIS.

SYSTEMI OF ELECTRIC-CURRENT DISTRIBUTION.

Specification of Letters Patent.

Patented Jan. 3, 1922.

Application filed February 16, 1920. Serial No. 359,171.

tric current distribution and resides in theprovision of improved means for supplying current to translating devices at low vol"- age from circuits furnishing current to other translating devices at high voltage. The system of my invention, for example, enables the operation of house bells by current supplied from commercial house lighting circuits.

The system embracing my invention 1s inclusive of an electro-magnet, having an armature switch, and a high resistance element included in series with this magnet in bridge of the mains; a second electroniagnet, also having an armature switch, and a translating device in series with this second magnet and together therewith in parallel with the first magnet, a normally open switch for including the second magnet and the translating device in circuit, a shunting resistance element brought in parallel with the translating device and in shunt of the first magnet by the armature switch of the second magnet upon the attraction thereof, and a normally open shunt about said high resistance element and established by the armature switch of the first magnet upon the release thereof, there being a current reducing winding in the connection between one terminal of the shunting resistance and the source of current.

The accompanying drawing shows the preferred embodiment of the invention, Fig. 1 illustrating the preferred circuit arrangement in its idle condition and Fig. 2 illustrating the system in operation.

The supply mains 1 and 2 convey current impressed thereon at the higher pressure, say 100 volts, by the direct current or other generator 3 to supply incandescentlamps 4 or other load. The lamp or other resistance device 5 may, for example, have a resistance of 2000 ohms. A magnet 6, itself of high resistance but of low resistance with respect to resistance element 5 and of, say, 300 ohms, is included in series with said eleient in the same bridge therewith between the mains whereby the magnet is constantly energized and the lamp normally glows to serve as an indicator of the Working condition of the circuit.

The low voltage translating device may be of relatively low or high resistance. The device illustrated includes a magnet 7, shown as of low resistance, say twoohms, normally partially included in circuit by its own armature switch 8 positioned by a spring 9 in the manner of make and break' bells and buzzers to which arrangement the invention is not to be limited. Supply conductors 10 and 11 respectively connect the translating device with the supply mains 1 and 2, lamp 5 being in the conductor 11. When the switch or push button 12 is closed, the translating device 7 is completely con nected in shunt of magnet 6. Suflicient current continues to flow through magnet 6 to maintain it energized until further instrumentalities operate. A magnet 13, whose winding 14 is preferably of the high resistance of 300 ohms, is in series with the translating device 7 and together therewith in parallel with magnet 6. Magnet 13 has a normally'open circuited resistance 15, say of one-half ohm, which is in parallel relation with the winding 14-. This resistance preferably, but not necessarily, is also a winding of magnet 13. lVhen switch 12 is closed, winding 14 of magnet 13 is initially energized, armature 16 thereupon engaging contacts 17 and 18 to close circuit through lowresistance 15 t0 shunt the high resistance winding 14-, enough current flowing through windings 14 and 15' to maintain the armature 16 attracted against the force of spring 19. When the armature 16 is thus attracted a low resistance shunt is established about magnet 6 that includes the shunting resistance 20, say of three ohms, the armature 16 and contact 17. The resistance of the shunt about magnet 6 that 001- lectively includes element 20, the armature 16, and contact 17, is sufiiciently high to divert sufiirient current through the translating device 7, if this device is of low resistance but whether the translating device be of low resistance or high resistance, resistance 20 is sufficiently low efiectively to shunt the magnet 6. The released armature 21 of this magnetis engaged'with its'back contact by the spring 22. When the magnet 6 is thus shunted its released armature establishes a the armature 16 of magnet 13 and the front contact-l7 of this armature. The translating device 7 is now mainly fed through the low resistance element 23 included in the COIIIIGCiilOIl between the source of current 15 erably in parallel with the high resistance element 5, resistance 23 being brought into and one terminal of resistance 20 and prefseries with the translating device by the released armature 21, the resistance element 20 now functioning to prevent the undue shunting of the operating current passing through the resistance 23 to the translating device and to reduce the voltage impressed the assumed values hitherto given, between the supply conductors 10 and 11 can never amount to more than 15 volts, to which reduced voltage the translating (1 vice 7 is subject ,when switch '12 is closed. With these assumed values 4.3 watts will normally flow through the magnet 6 and live amperes of currentwill HOW to the left hand terminal of resistance 20 where the current divides, a part flowing through tiis resist ance 20 and a part through the translating device 7, these current portions being in the same ratio as the resistances 7 and 20.

The vibrating bell 7 may act so sluggishly that the circuit of magnet 13 would be broken and the armature of this magnet retracted from, the contacts 17 and 18, while theiswitch 12 is closed. I therefore make the armature 16 slow to release by providing the armature end of the core of the magnet 13 with a closed copper conductor in accordance with common practice.

While I have herein shown and particularly described the preferred embodiment of my invention I do not wish to be limited to the precise details of construction shown as changes may readily be made without departing from the spirit of my invention, but having thus described my invention I claim as new and desire to secureby Letters Patent the following 1. A system of electric current-distribution including a source of current; supply mains in circuit with said source of current; an electroanagnet, having an armature switch, and a high resistance element included in series with this magnet in bridge of said mains; a second electro-magnet, also having an armature switch, and a translating device inseries with this second magnet and together therewith in parallel with the first magnet;-anormally open switch for including the second magnet and the translating device in circuit; a-shunting resistance element brought in parallel with the translating device and in shunt of the first magnet by the armature switch of the second magnet upon the attraction thereof to de-energize the first magnet; a normally open shunt about said high resistance elementand established by the armature switch of the first magnet upon the release thereof; and a current reducing winding in the connection between one terminal of the shunting resistance and the source of current.

lating device in series with this second mag.

net and together therewith in parallel with the first magnet, the second magnet having a high resistance winding and a low resist-- ance brought into shunting relation with the high resistance winding by the armature switch of this magnet when attract-en; a

normally open switch for including the sechigh resistance element and established by the armature switch of the first magnet upon the release thereof; and a current reducing winding in the connection between one terminal of the shunting resistanceand the source of current. r

In witness whereof, I hereunto subscribe my name this 5th day or February,

CHARLES A. TURNER. 

